En el presente trabajo se presenta un análisis de la transmitancia de la radiación solar en un invernadero con techo curvo para producción de jitomate en Irapuato, Gto., México. Se consideró un modelo que involucra la latitud del lugar, la…

The primary objective of this study was to improve the quality of tomatoes by the manipulation of ionic relations in the nutritive solution based on the hypothesis that potassium influences carotenoid syntheses in tomato fruits. Two experiments were done using…

Context: Like many sub Saharan African cities, Yaoundé is experiencing a faster growth of its population and urban perimeter. The urban population has grown from 812 000 inhabitants in 1987 to 2 100 000 inhabitants in 2006. However, this population…

This study had the purpose of identifying personal, family and social determinants that can intervene in the pregnancy of teenagers of the city of San Francisco del Rincón, Gto. (Mexico). It was a field study, with a traverse, comparative and…

Introduction: The annual incidence of scorpion stings in the State of Guanajuato, Mexico, during 2000-2005 period was more than an average 24,000 cases per year, with a mortality rate of 3 people every year; it affects a population nucleus both…

La Web es sin lugar a dudas el repositorio de información más grande jamás construido por el ser humano. Con más de cuatro mil millones de páginas indexadas por los motores de búsqueda públicos, la Web representa el mayor y…

The Chapala lake has been exposed to several sources and levels of contamination, like municipal discharges of different communities, waters of agricultural return and residual waters poured by industries, coming from the Lerma river. Therefore, it is important to characterize…

Type 2 diabetes mellitus the most frequent metabolic disease, is induced by factors so far largely unknown. Genetic and environmental causes are implicated, among the latter obesity and sedentary life are the most important. The discovery of new hormones controlling…

Se puede decir con un buen grado de incertidumbre, que en las próximas décadas la estructura del sistema educativo será cada vez más rectangular; que en los siguientes veinte años la presión por ingresar al sistema educativo disminuirá en la…